“Database independence isn’t a terribly high priority at the moment because there really isn’t that demand for it. (You’re the first to even mention it.)”
While I realise I’m responding to a message posted 9 months or so ago, I wanted to point out something in regards to this comment.
Speaking from personal experience, if I see a product that I’m interested in, and it states point blank that it only supports MySQL, I’m much more inclined to just close the site and go on to try and find something that is database independant/supports multiple databases. This might account for why not many people are requesting the feature as much, because they become disenfranchised at the mention of sole MySQL support and just leave.
The odds are that there are probably quite a few people that would like to see this, and many other products, availible for more than just MySQL, and by ignoring them you’re probably ignoring a lot of potential users.